Gavinmad
Mr. Poopybutthole
Bran is the heir of House Stark, and if Bran can't be found, Rickon is the heir. Rickon's location is known in both the books and the show. Even if they couldn't find Bran or Rickon, without someone to actually press Sansa's claim, the crown of the north would pass to House Karstark, not Sansa.Did you forget the Stark's renounced the authority of the King? Sansa has claim to absolute rule of the north and no allegiance to anyone claiming to be king.
She can do whatever the hell she wishes.